﻿using HelloWPF.Utility;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Data;

namespace HelloWPF.Study.DataBinding.ValueConverter
{
   public class BooleanToVisibilityConverter : IValueConverter
    {
        /// <summary>
        /// 从源到目标转换
        /// </summary>
        /// <param name="value"></param>
        /// <param name="targetType"></param>
        /// <param name="parameter"></param>
        /// <param name="culture"></param>
        /// <returns></returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
           if(value != null)
            {
                if (value.ToBool() == true)
                {
                    return Visibility.Visible;
                }
               else
                {
                    return Visibility.Collapsed;
                }
            }
           else
            {
                return Visibility.Collapsed;
            }
        }

        /// <summary>
        /// 从目标到源转换
        /// </summary>
        /// <param name="value"></param>
        /// <param name="targetType"></param>
        /// <param name="parameter"></param>
        /// <param name="culture"></param>
        /// <returns></returns>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return null;
        }
    }
}
